[PATCH v5 0/2] Fix lockdep issues seen in CoreSight configfs interface

[Mathieu Poirier]

On Tue, Jun 28, 2022 at 06:30:02PM +0100, Mike Leach wrote:
> Issues with lockdep possible deadlock scenarios have been reported when using the
> coresight configfs interface handling complex configuration, when unloading modules.
> 
> These are due to holding the main configuration mutex during configfs register, but
> taking it later when accessing configfs files.
> 
> The patches improve the clean up of configurations and update load and unload of
> configurations and initialisation of configfs to fix the locking mechanisms.
> 
> Applies to coresight/next (5.19-rc2)
> Tested on DB410c (with patch [0] also applied to fix separate console boot issue). 
> 
> Fixes: eb2ec49606c2 ("coresight: syscfg: Update load API for config loadable modules")
> Reported-by: Suzuki Poulose <suzuki.poulose at arm.com>
> Signed-off-by: Mike Leach <mike.leach at linaro.org>
>

Applied.

Thanks,
Mathieu

> [0] https://lkml.kernel.org/r/20220614124618.2830569-1-suzuki.poulose@arm.com
> 
> Changes since v4:
> No functional change - fixed comment in patch header 1/2 and error string format to
> remove checkpatch warning as requested by Mathieu.
> 
> Changes since v3:
> Addressed minor issues raised by Suzuki.
> 
> Changes since v2:
> Added additional work to fix load and unload ops after issue recurred
> due to file access.
> 
> Mike Leach (2):
>   coresight: configfs: Fix unload of configurations on module exit
>   coresight: syscfg: Update load and unload operations
> 
>  .../hwtracing/coresight/coresight-config.h    |   2 +
>  .../hwtracing/coresight/coresight-syscfg.c    | 298 +++++++++++++++---
>  .../hwtracing/coresight/coresight-syscfg.h    |  13 +
>  3 files changed, 261 insertions(+), 52 deletions(-)
> 
> -- 
> 2.17.1
>